You can try the dealer they will have it in stock or will order it.i found 1 for my 89 6 cyl at advance auto parts in a small section where the vacume line connectors and window crank knobe are by the oil section.if u have the old 1 its easier to mach up, or u can use a piece of paper and trace the diameter of the whole and compare it to the new grommets center diameter.

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The solution is to remove the grommet on the valve cover (for the small line) and replace it with a grommet for a 1985 CJ7 along with the PCV valve for the CJ7. Prior to replacing the grommet, you must bend a metal tang inside the valve cover using a screwdriver. This tang is what forms the "spring" in the built in CCV valve. Bending it up, opens the valve all the way permanently.

Next, take a 3/8 inch quick connect air chuck (the kind you screw into a blow-gun or tire chuck for use on an air compressor equipped with quick connect fittings) and replace the screw in nipple on the manifold (where the original tube attaches) with the air chuck. The chuck is an exact fit (threading and length)but has a much larger internal diameter for the crankcase gases to flow. Finally run a section of 3/8 inch fuel line from the newly installed PCV valve to the new air chuck nipple you screwed into the intake manifold. Attach a hose clap at each end of the fuel line and you're done.

Check your pcv valve and make sure the vacuum line that goes to it is not plugged up.If that's clear and the valve is good then likely you have excessive blow-by ...that is caused by ring and cylinder wall wear. On an engine that old, it's normal but unfortunate. In that case, the only real fix is an engine rebuild but you may be able to minimize how much comes out of there by adding a good viscosity improver like lucas additive. A new breather grommet or seal may also help contain a bit of what's leaking as well.

On top of the valve cover there is a fresh air breather unit. Make sure the breather unit is not plugged.Also the fixed orificePCV should be clear. Find a tool that will go through the orifice and make sure it is clean. Remove the vacuum hose and check it for cracks or internal damage. With the engine running, make sure you have vacuum through the hose.Let me know when your finished cleaning the crankcase breather system.Regards,